Gravity pipes and culverts with different lengths, special profiles, and particular site conditions can be rehabilitated by the Spiral-Wound pipe rehab technologies under live flow conditions. The process involves winding an endless PVC or HDPE profile strip into a waste- or stormwater pipeline to connect it to a new watertight pipe in the old pipe. The SPR version is specially designed for the renewal of large diameters up to 196 in. and custom-shaped profiles. Sekisui SPR Americas LLC.